Adjective. Tending to produce or aggravate acne. From the Latin roots comedo (blackhead) and -genic. Comedo means glutton in Latin, and came to mean blackhead from a comparison of the worm-like shape of the waxy material that can be squeezed from a blackhead to a worm believed to feed on the body. Nice.

In U.S. (FDA-regulated) product labelling, the more commonly encountered "non-comedogenic" means "does not clog pores or cause blemishes." and Galderma helped out on this one.

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